The Complete Reloading Manual for the .375 and .458 Winchester (One Book / One Caliber) Spiral-bound – January 1, 2004

Very nice guide for the 375 Winchester. Can't speak for the 458, but I'm sure it is equally useful.

For individual calibers these little books can't be beat. also they tend to have old and obsolete info left out of general reloading manuals that tend to favor one bullet or brand of powder or primer over others. Lets just call them the unbias little books. I highly recommend them.

Used this to log in my reloading data with different bullets and different powders. Great Resource with data to help.